Rudbeckia plant named ‘ET RDB 621’

ABSTRACT

A new and distinct cultivar of  Rudbeckia  plant named ‘ET RDB 621’, characterized by its compact, upright to somewhat outwardly spreading and mounded plant habit; freely branching growth habit; freely flowering habit; large single-type inflorescences with yellow orange and greyed orange bi-colored ray florets positioned above the foliar plane on strong peduncles; and good postproduction and garden performance.

Botanical designation: Rudbeckia hirta X Rudbeckia hybrida.

Cultivar denomination: ‘ET RDB 621’.

BACKGROUND OF THE INVENTION

The present invention relates to a new and distinct cultivar of Rudbeckia plant, botanically known as Rudbeckia hirta X Rudbeckia hybrida and hereinafter referred to by the name ‘ET RDB 621’.

The new Rudbeckia plant is a product of a planned breeding program conducted by the Inventors in Boijl, The Netherlands. The objective of the breeding program is to create new Rudbeckia plants with small leaves and large long-lasting and attractive inflorescences on strong peduncles.

The new Rudbeckia plant originated from a cross-pollination made by the Inventors in Boijl, The Netherlands in 2015 of a proprietary selection of Rudbeckia hirta identified as code designation M3542, not patented, as the female, or seed parent with a proprietary selection of Rudbeckia hybrida identified as code designation M2069, not patented, as the male, or pollen, parent. The new Rudbeckia plant was discovered and selected by the Inventors as a single flowering plant from within the progeny of the stated cross-pollination in a controlled environment in Boijl, The Netherlands in 2016.

Asexual reproduction of the new Rudbeckia by in vitro meristem culture in a controlled greenhouse environment in Boijl, The Netherlands since 2016 has shown that the unique features of this new Rudbeckia plant are stable and reproduced true to type in successive generations.

SUMMARY OF THE INVENTION

Plants of the new Rudbeckia have not been observed under all possible combinations of environmental conditions and cultural practices. The phenotype may vary somewhat with variations in environmental conditions such as temperature and light intensity, without, however, any variance in genotype.

The following traits have been repeatedly observed and are determined to be the unique characteristics of ‘ET RDB 621’. These characteristics in combination distinguish ‘ET RDB 621’ as a new and distinct Rudbeckia plant:

-   -   1. Compact, upright to somewhat outwardly spreading and mounded         plant habit.     -   2. Dense and bushy growth habit     -   3. Freely flowering habit.     -   4. Large single-type inflorescences with yellow orange and         greyed orange bi-colored ray florets positioned above the foliar         plane on strong peduncles.     -   5. Good postproduction and garden performance.

Plants of the new Rudbeckia differ from plants of the female parent selection in the following characteristics:

-   -   1. Plants of the new Rudbeckia are taller than plants of the         female parent selection.     -   2. Inflorescences of plants of the new Rudbeckia are longer         lasting than inflorescences of plants of the female parent         selection.

Plants of the new Rudbeckia differ from plants of the male parent selection in the following characteristics:

-   -   1. Plants of the new Rudbeckia are taller and more upright than         plants of the male parent selection.     -   2. Inflorescences of plants of the new Rudbeckia are longer         lasting than inflorescences of plants of the male parent         selection.

Plants of the new Rudbeckia can be compared to Rudbeckia hybrida ‘ET RDB 410’, disclosed in U.S. Plant Pat. No. 29,163. Plants of the new Rudbeckia differ primarily from plants of ‘ET RDB 410’ in the following characteristics:

-   -   1. Plants of the new Rudbeckia are more compact than plants of         ‘ET RDB 410’.     -   2. Plants of the new Rudbeckia and ‘ET RDB 410’ differ in ray         floret color as plants of the new Rudbeckia have yellow orange         and greyed orange bi-colored ray florets whereas plants of ‘ET         RDB 410’ have yellow and greyed orange bi-colored ray florets.

Plants of the new Rudbeckia can also be compared to Rudbeckia hirta X Echinacea purpurea ‘ET-RDB 01’, disclosed in U.S. Plant Pat. No. 25,221. Plants of the new Rudbeckia differ primarily from plants of ‘ET-RDB 01’ in the following characteristics:

-   -   1. Plants of the new Rudbeckia are more compact than plants of         ‘ET-RDB 01’.     -   2. Plants of the new Rudbeckia have larger inflorescences than         plants of ‘ET-RDB 01’.     -   3. Plants of the new Rudbeckia and ‘ET-RDB 01’ differ in ray         floret color as plants of the new Rudbeckia have yellow orange         and greyed orange bi-colored ray florets whereas plants of         ‘ET-RDB 01’ have yellow, orange and red-colored ray florets.

BRIEF DESCRIPTION OF THE PHOTOGRAPHS

The accompanying photographs illustrate the overall appearance of the new Rudbeckia showing the colors as true as it is reasonably possible to obtain in colored reproductions of this type. Colors in the photographs may differ slightly from the color values cited in the detailed botanical description which accurately describe the colors of the new Rudbeckia plant.

The photograph on the first sheet comprises a side perspective view of a typical flowering plant of ‘ET RDB 621’ grown in a container.

The photograph on the second sheet is a close-up view of typical inflorescences of ‘ET RDB 621’.

DETAILED BOTANICAL DESCRIPTION

The aforementioned photographs and following observations, measurements and values describe plants grown in 2.5-liter containers during the spring in an outdoor nursery in Boijl, The Netherlands and under cultural conditions typical of commercial Rudbeckia production. During the production of the plants, day temperatures averaged 16° C. and night temperatures averaged 10° C. Plants were one year old when the photographs and the detailed description were taken. In the following description, color references are made to The Royal Horticultural Society Colour Chart, 2001 Edition, except where general terms of ordinary dictionary significance are used.

-   Botanical classification: Rudbeckia hirta X Rudbeckia hybrida ‘ET     RDB 621’. -   Parentage:     -   -   Female, or seed, parent.—Proprietary selection of Rudbeckia             hirta identified as code designation M3542, not patented.         -   Male, or pollen, parent.—Proprietary selection of Rudbeckia             hybrida identified as code designation M2069, not patented. -   Propagation:     -   -   Type.—By in vitro meristem culture.         -   Time to initiate roots.—About seven to eight days at soil             temperatures about 15° C. and ambient temperatures about 20°             C.         -   Time to produce a rooted young plants.—About four weeks at             soil temperatures about 15° C. and ambient temperatures             about 20° C.         -   Root description.—Medium in thickness; fleshy; color, close             to 162C.         -   Rooting habit.—Freely branching; medium density. -   Plant description:     -   -   Plant and growth habit.—Herbaceous perennial; compact,             upright to somewhat outwardly spreading and mounded plant             habit; dense and bushy appearance; vigorous growth habit;             moderate growth rate.         -   Plant height.—About 40 cm to 50 cm.         -   Plant width.—About 40 cm to 50 cm.         -   Lateral branches (peduncles).—Length: About 15 cm to 25 cm.             Diameter: About 4 mm to 6 mm. Internode length: About 4 cm             to 10 cm. Angle: Upright to somewhat outwardly spreading.             Strength: Strong. Texture: Rough, pubescent. Color: Close to             144A; spots, close to 187A. -   Leaf description:     -   -   Arrangement.—Alternate or opposite, simple; sessile.         -   Length.—About 10 cm to 20 cm.         -   Width.—About 2 cm to 5 cm.         -   Shape.—Oblanceolate to lanceolate.         -   Apex.—Acute to acuminate.         -   Base.—Attenuate.         -   Margin.—Dentate; undulate.         -   Texture, upper and lower surfaces.—Pubescent; rough.         -   Venation pattern.—Pinnate.         -   Color.—Developing and fully expanded leaves, upper surface:             Close to 137A; venation, close to 145A. Developing and fully             expanded leaves, lower surface: Close to 137C; venation,             close to 145A. -   Inflorescence description:     -   -   Type and arrangement.—Single-type inflorescence form with             lanceolate to oblanceolate-shaped ray florets and tubular             disc florets; inflorescences borne on terminal and axillary             peduncles above and beyond the foliar plane on strong             peduncles; ray and disc florets arranged acropetally on a             capitulum.         -   Fragrance.—None detected.         -   Flowering season.—Plants begin flowering about ten weeks             after planting; long flowering period, plants flower             continuously from mid-July until the end of October in The             Netherlands.         -   Inflorescence longevity.—Good postproduction longevity with             inflorescences lasting about eight to ten weeks on the             plant; inflorescences persistent.         -   Quantity of inflorescences.—Freely flowering habit,             typically more than 50 inflorescences developing per plant             during the flowering season.         -   Inflorescence buds.—Height: About 1 cm to 2 cm. Diameter:             About 1 cm to 2 cm. Shape: Round. Color: Close to 145A.         -   Inflorescences.—Diameter: Large, about 10 cm to 15 cm. Depth             (height): About 3 cm. Diameter of disc: About 2 cm to             3.5 cm. Receptacle height: About 5 mm to 8 mm. Receptacle             diameter: About 7 mm to 10 mm. Receptacle color: Close to             144A.         -   Ray florets.—Number of ray florets per inflorescence: About             12 to 23 arranged in a single whorl. Length: About 5 cm to             6 cm. Width: About 1.5 cm. Shape: Lanceolate to             oblanceolate. Apex: Emarginate. Base: Attenuate. Margin:             Entire. Texture, upper surface: Smooth, glabrous. Texture,             lower surface: Rough, glabrous. Color: When opening, upper             surface: Distally, close to 13A; proximally, close to N167A             to N167B; venation, similar to lamina colors. When opening,             lower surface: Close to 151C to 151D; venation, close to             145A. Fully opened, upper surface: Distally, close to 15A;             proximally, close to 175B; at the base, close to 200B;             venation, close to 175B; color does not change with             development. Fully opened, lower surface: Close to 153D;             venation, close to 145A.         -   Disc florets.—Arrangement: Numerous disc florets massed at             center of receptacle. Length: About 1 cm to 2 cm. Width:             About 1 mm to 2 mm. Shape: Tubular, elongated. Apex: Obtuse.             Color, when opening and fully opened: Close to N187A.         -   Phyllaries.—Number of phyllaries per inflorescence: About 20             to 30 in about two whorls. Length: About 1 cm to 3 cm.             Width: About 3 mm to 7 mm. Shape: Lanceolate. Apex: Acute to             obtuse. Base: Fused. Margin: Entire; slightly undulate.             Texture, upper and lower surfaces: Rough, pubescent. Color,             upper surface: Close to 146A. Color, lower surface: Close to             146B.         -   Reproductive organs.—Androecium (present on ray and disc             florets): Quantity per floret: Numerous. Filament length:             About 1 mm to 2 mm. Filament color: Close to N187A. Anther             shape: Round. Anther length: About 1 mm to 2 mm. Anther             color: Close to N187A. Pollen amount: Abundant. Pollen             color: Close to 12A. Gynoecium (present only on disc             florets): Pistil length: About 2 mm to 3 mm. Stigma shape:             Two-parted. Stigma color: Close to N187A. Style length:             About 1 mm to 2 mm. Style color: Close to N187A.         -   Seeds and fruits.—To date, seed and fruit production has not             been observed on plants of the new Rudbeckia. -   Pathogen & pest resistance: To date, plants of the new Rudbeckia     have not been observed to be resistant to pathogens and pests common     to Rudbeckia plants. -   Garden performance: Plants of the new Rudbeckia have been observed     to have good garden performance and to tolerate wind, rain and     temperatures from about −20° C. to about 40° C. 

It is claimed:
 1. A new and distinct Rudbeckia plant named ‘ET RDB 621’ as illustrated and described. 